Horizontal lathe

Patent metadata

Field	Value
Publication number	US-11511357-B2
Application number	US-201916535347-A
Country	US
Kind code	B2
Filing date	Aug 8, 2019
Priority date	Feb 15, 2017
Publication date	Nov 29, 2022
Grant date	Nov 29, 2022

Abstract

A horizontal lathe for manufacturing a porous optical fiber preform, the horizontal lathe being configured to hold and fix two opposite ends of a target in such a manner that a longitudinal direction of the target is a substantially horizontal direction, and cause the target to be rotated around an axis parallel to the longitudinal direction thereof as a rotation axis. The horizontal lathe includes a thermal expansion absorbing mechanism configured to absorb a change in dimension of the target, the change being due to thermal expansion of the target in a direction of the rotation axis.

First claim

What is claimed is:

1. A horizontal lathe for manufacturing a porous optical fiber preform, the horizontal lathe being configured to hold two opposite ends of a target in such a manner that a longitudinal direction of the target is a substantially horizontal direction, and cause the target to be rotated around an axis parallel to the longitudinal direction thereof as a rotation axis, the horizontal lathe comprising:
a first chuck jaw configured to hold one end of a target and be rotatable about the rotation axis;
a second chuck jaw configured to hold another end of the target and be rotatable about the rotation axis;
a chuck block fixed to the second chuck jaw, the chuck block having a protruding part provided on one side thereof that is opposite to another side thereof to which the second chuck jaw is fixed;
an axle receiving part including a recessed part, the recessed part configured to allow the protruding part of the chuck block to move therewithin;
a spring that links a surface of the protruding part that faces the recessed part with a surface of the recessed part that faces the protruding part; and
a bearing provided between an inner circumferential surface of the recessed part of the axle receiving part and an outer circumferential surface of the protruding part of the chuck block, the bearing configured to allow the second chuck jaw and the chuck block to move in a range of motion that spans between the surface of the recessed part that faces the protruding part and the surface of the protruding part that faces the recessed part,
wherein the recessed part, the protruding part and the bearing form a thermal expansion absorbing mechanism that absorbs a change in dimension of the target, the change being due to thermal expansion of the target in a direction of the rotation axis.

2. The horizontal lathe according to claim 1 ,
wherein the spring is a tension spring that is configured to cause tensile force to act on the axle receiving part and the chuck block in a direction in which the tension spring contracts.

Assignees

• Furukawa Electric Co Ltd

Inventors

• Takahashi Tadashi

Classifications

• B23B23/00

  Tailstocks; Centres {(for grinding machines B24B41/062)} · CPC title

• B23B31/1627

  Details of the jaws · CPC title

• Y02P40/57

  Improving the yield, e-g- reduction of reject rates · CPC title

• B23B31/2073 Primary

  Axially fixed cam, moving jaws (B23B31/20125 takes precedence) · CPC title

• B23B31/20 Primary

  Longitudinally-split sleeves, e.g. collet chucks · CPC title